frydfsh Posted May 12, 2005 Share Posted May 12, 2005 I'm looking at a 70 455, how doe's one ID the year and cid of this vintage Buick engine? Link to comment Share on other sites More sharing options...
Roadhog Posted August 18, 2005 Share Posted August 18, 2005 On the left head below the #1 and #2 plug is the engine serial # which should match the vehicle ser. #. On the left head below #5 and #7 plug is the Production code and the first prefix is the engine type; 455-4 is code SR (350 HP 10:1 comp ratio), Stage 1 455-4 is code SS (360 HP 10.5:1), and 455-4 is code SF (370 HP 10:1). They are all rated at 510 Ft Lb of torque. The last #'s are the production date. HAPPY HUNTING! Link to comment Share on other sites More sharing options...
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